Bolt-pointing machine



(No Model.)

1:". B1. SCOPIELD. BOLT POINTNG MACHINE.

No. 409,244. Patented Aug. 20, 1889.

JNVNTOR.

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WTNESSES. 7k (SMU.

ATTORNEYS NiTED STATES PATENT OFFICE.

BOLT-POINTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 409,244, dated August 20, 1889.

Application filed February 7, 1889. Serial No. 299,061. (No model.)

To all whom it may concern:

Beit known that I, FRANK R. Seemann, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Bolt-Pointing Machines; and I do hereby declare the following to bea full, clear, and exact description of the l invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in bolt-pointing machines in which the carriage bearing the bolt-holder is reciprocated toward and from the cutter-head by means of cams of peculiar construction, with a spring' acting rearward 'on the carriage to take up the lost motion of the parts, the cam mechanism being -intergeared with the spindle bearing the cutter-head, the object being by such automatic feed to increase the capacity of the machine and to lessen the manual labor necessary in attending such machine.

In the accompanying drawings, Figure l is a side elevation. Fig. 2 is a plan, partly in section, the cutter-head, spindle, and attachments being removed. Fig. 3 is an end elevation, partly in section. Fig. 4 is a view in perspective, being a detail of the cams.

A represents the bed-plate, having attached ways A', on which latter the carriage B reciprocates. The carriage has a longitudinal recess l), the same having undercut walls for engaging the head of bolt c, by means of which the bolt-holder C is adjustably secured to the carriage, and may therefore be adjusted lengthwise the carriage, according to length of bolt.

D is a spindle, `on which the cutterhead D is mounted. The spindleis journaled in boxes a of the bedplate, the spindle having attached worm (l, for engaging worm-gear E. The spindle has also driving and loose pulley d. GearE is mounted on the lateral shaft E', and on this shaft are mounted side by side cams E2 and Ei", the two cams being usually cast integral.

F is the cam-yoke, the latter beingintegral or connected with sliding bar f, this in turn being connected, as shown, with carriage B, for reciprocating the latter.

II and Il are contact-points for engaging,

respectively, cams E2 and in the order named, these contact-points being connected with opposite ends and sides of the yoke to bring the respective contact-points in the desired position and respectively in line with the engaging cams. Cam E2 from c to e is quite abrupt, by means of which the carriage is quickly moved toward the cutter-head to bring the end of the bolt to engagement with the cutter. From c to e the throw of the cam is gradual to feed the bolt slowly while the metal is being cut away, and in producing the conical or chamfered end required on the bolt preparatory to the subsequent screw-threading of the bolt.

As cam E2 is disengaged from contact-poi nt II cam E3 engages contact-point Il". rlhis latter cam has a sharp pitch, whereby the carriage is quickly reversed, after which the carriage remains stationary for a moment, during which time the operator removes the pointed bolt from the bolt-holder and inserts another bolt for pointing, after which the same movements hereinbefore described are repeated. IVith this construction there is no lost time, the carriage being instantly reversed. The spring' Gr, attached the one end to bar j" or to the carriage and the other end to a stationary part of the machine, helps to draw the carriage away from the cutter-head. This spring has considerable tension, and takes up the lost motion of the parts, whereby the contact-point is held firmly to its engagement with cam E2, resulting in a steady feed of the bolt during the pointing operation, and whatever lost motion there may be only causes the carriage to remain longer at rest while the bolts are being changed. There is considerable wear on the cams and contact-points, and hence the latter are adjustably secured to the yoke, so that such wear may be taken up from time to time. The cams are quite inexpensive, requiring no nice fitting, and as these become worn they may be replaced with new ones.

In pointing large bolts there is of course much more metal to be cut away than there is in small bolts, and consequently the feed for large bolts must be proportionately slow in movement.

In a boltcutting establishment there are IOO usually several bolt-pointing machines, adjusted, respectively, for large, medium, and smaller bolts, the same pattern of cams being used on each; but the Worms used in cutting small bolts have greater pitch and the Wor1ngear has correspondingly less teeth, whereby the carriage is actuated with less revolutions of the spindle,Wor1ns of less pitch being' used for intermediate size, and Worms of still less pitch being used for cutting large bolts, the Worm-gear of course being made to correspond with the Worms. The bolt-holder and the cutter for pointing the bolts are of ordinary construction, and therefore need not be described in detail.

l. In a bolt-pointing machine, the combination of reciprocating carriage bearing boltholder and cams for reciprocating the carriage, and a sliding bar and cam-yoke connecting the carriage and cams, substantially as set forth.

2. In a bolt-pointing machine, the combination, with a reciprocating carriage and cams for reciprocating the carriage, of a sliding bar and cam-'yoke connecting the carriage and cams, and a spring in its movements away from the cutter-head, substantially as set forth.

In testimony whereof I sign this speciication, in the presence of two Witnesses, this 24th day of December, 1888.

FRANK R. SCOFIELD.

IVitiiesses:

S. G. NOTTINGHAM, ALBERT E. LYNCH.

r assisting the carriage l 

